I'm having this issue on a ListView in my app - but only on this one. I use grouping on other lists too, but this one list screws it up.
Here are some images:
The dates are the headers.
On other lists, headers do not stack up like this - and in this case, I'm pretty sure it is a renderer issue, as the group headers not just stack on each other, but overlap actual list items.
Code: https://gist.github.com/fonix232/01a9db0eeb36e059c607
What can be the issue?